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post #1 of Old 07-26-2007 Thread Starter
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reduced exhaust water

Any ideas about cleaning out the Yanmar diesel heat exchanger on a PSC 37? When the engine is running, seawater still come out the exhust, but it's a lot smaller volume than formerly. I've cleaned out the thru-hull for the seawater intake as well as the seawater strainer. With the seawater pump cover off and the intake line open, seawater flows out freely at the open pump. I've also replaced the seawater pump impeller even though the old one looked fine.

I'm concerned that, despite the above actions, the volume of exhaust water remains diminished, even though the engine has not yet over- heated. In case marine growth built up during a period of disuse, I've wondered about pumping Liquid Plummer into the seawater inlet of the exhanger for a little while and then flushing it out. Removing the heat exhanger looks like rather serious engine work to me, so I was hoping for a simpler fix. Thanks.

Bob Ford
s/v Talos IV, 1995 PSC 37 #306
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